package cn.tedu.boot32.controller;

import cn.tedu.boot32.utils.DBUtils;
import cn.tedu.boot32.vo.Emp;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

@Controller
public class EmpController {
    @RequestMapping("/insert")
    @ResponseBody
    public String insert(Emp emp){
        try (Connection conn = DBUtils.getConn()){
            System.out.println("emp = "+ emp);

            String sql = "insert into myemp values(null,?,?,?,?)";
            PreparedStatement insertPs = conn.prepareStatement(sql);
            insertPs.setString(1,emp.getName());
            insertPs.setString(2,emp.getJob());
            insertPs.setInt(3,emp.getAge());
            insertPs.setInt(4,emp.getSalary());
            insertPs.executeUpdate();//执行插入操作
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return "添加完成!<a href='/'>回到首页</a>";
    }

    @RequestMapping("/select")
    @ResponseBody
    public String select(){
        ArrayList<Emp> list = new ArrayList<>();
        try (Connection conn = DBUtils.getConn()){
            String sql = "select *from myemp";
            PreparedStatement ps = conn.prepareStatement(sql);
            ResultSet rs = ps.executeQuery();
            while (rs.next()){
                int id = rs.getInt(1);
                String name = rs.getString(2);
                String job = rs.getString(3);
                int age = rs.getInt(4);
                int salary = rs.getInt(5);
                list.add(new Emp(id,name,job,age,salary));
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        //把员工的信息装进html标签中 最后返回给客户端
        String html = "<table border=1>";
        html+="<caption>员工列表</caption>";
        html+="<tr><th>id</th><th>名字</th><th>工作</th>" +
                "<th>年龄</th><th>工资</th><th>操作</th></tr>";
        for (Emp e:list) {
            html+="<tr>";
            html+="<td>"+e.getId()+"</td>";html+="<td>"+e.getName()+"</td>";
            html+="<td>"+e.getJob()+"</td>";html+="<td>"+e.getAge()+"</td>";
            html+="<td>"+e.getSalary()+"</td>";
            html+="<td><a href='/delete?id="+e.getId()+"'>删除</a></td>";
            html+="</tr>";
        }
        html+="</table><a href='/'>回到首页</a>";
        return html;
    }

    @RequestMapping("/delete")
    @ResponseBody
    public String delete(int id){
        System.out.println("id = "+id);
        try (Connection conn = DBUtils.getConn()){
            String sql = "delete from myemp where id=?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setInt(1,id);
            ps.executeUpdate();//执行删除SQL语句
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return "删除完成<a href='/select'>返回列表页面</a>";
    }

    @RequestMapping("/update")
    @ResponseBody
    public String update(Emp emp){
        System.out.println("emp = "+emp);
        try (Connection conn = DBUtils.getConn()){
            String sql = "update myemp set name=?,job=?,age=?,salary=? where id=?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1,emp.getName());
            ps.setString(2,emp.getJob());
            ps.setInt(3,emp.getAge());
            ps.setInt(4,emp.getSalary());
            ps.setInt(5,emp.getId());
            ps.executeUpdate();//执行修改操作
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return "修改完成!<a href='/select'>返回列表页面<a>";
    }
}
